Alander, J.Mantyla, M.RANTANEN, T.P.J.W. ten Hagen2015-09-292015-09-2919831017-4656https://doi.org/10.2312/eg.19831005Solid modeling systems are now entering industrial usage. To guarantee their wide applicability, the capabilities of solid modelers should be enhanced to allow inclusion of free-form surfaces in their geometric models, however. Based on our evolving work, we describe the methodology and some key components of a solid modeler with parametric surface processing capability. Emphasis is put on a clean and extendible design that avoids the arbitrary restrictions which often are present in current systems.10.2312/eg.19831005